package com.webserver_v3.http;

import javax.activation.MimetypesFileTypeMap;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.Socket;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

public class HttpServletResponse {
    private Socket socket;
    private int statusCode = 200;
    private String statusReason = "OK";
    private File contentFile;
    private Map<String,String> headers = new HashMap<>();

    private MimetypesFileTypeMap mime = new MimetypesFileTypeMap();
    public HttpServletResponse(Socket socket) {
        this.socket = socket;
    }

    public void response() throws IOException {
        //1.发送状态行
        sendStatusLine();
        //2.发送响应头
        sendHeader();
        //3.发送响应正文
        sendContent();
    }

    //1.发送状态行
    private void sendStatusLine() throws IOException {
        println("HTTP/1.1 " + statusCode + " " + statusReason);
    }

    //2.发送响应头
    private void sendHeader() throws IOException {
        Set<Map.Entry<String,String>> entrySet = headers.entrySet();
        for (Map.Entry<String,String> e :entrySet){
            String key = e.getKey();
            String value = e.getValue();
            println(key+": "+value);
        }
        //单独发送响应头表示消息头发送完毕
        println("");

    }

    //3.发送响应正文
    private void sendContent() throws IOException {
        OutputStream out = socket.getOutputStream();
        try (
                FileInputStream fis = new FileInputStream(contentFile);
        ){
        byte[] data = new byte[10240];
        int length;
        while ((length = fis.read(data)) != -1) {
            out.write(data, 0, length);
        }

    }

}
    private void println(String line) throws IOException {
        OutputStream out = socket.getOutputStream();
        out.write(line.getBytes(StandardCharsets.ISO_8859_1));
        out.write(13);
        out.write(10);
    }

    public void addHeader(String name,String value){
        headers.put(name,value);
    }
    public int getStatusCode() {
        return statusCode;
    }

    public void setStatusCode(int statusCode) {
        this.statusCode = statusCode;
    }

    public String getStatusReason() {
        return statusReason;
    }

    public void setStatusReason(String statusReason) {
        this.statusReason = statusReason;
    }

    public File getContentFile() {
        return contentFile;
    }

    public void setContentFile(File contentFile) {
        this.contentFile = contentFile;
        addHeader("Content-Type", mime.getContentType(contentFile));
        addHeader("Content-Length",contentFile.length()+"");
    }
}
